Electric control apparatus



I INVENTOR W S FERDON ELECTRIC CONTROL APPARATUS Filed June 13, 1923 Oct. 23, 1928.

WITNESSES A TTQRNE; YS

Patented Oct. 23, 1928.

UNITED I STATES w'nimnr s EERDON, or OMAHA, mmansx'n. j

ELECTRIC CONTROL APPARATUS.

Application filed June 13,

This invention relates to an electric con-' trol apparatus for wireless telephony.

The present invention more particularly relates to a control apparatus for receiving units employed in wireless telephony.

The object of the invention is to provide an apparatus of the above characterwhereby sounds of different pitch such as transmitted by wirelesstelephony may be segregated and employed to set into motion through cooperating devices and electric circuits definite mechanical motions.

It is also an object of the invention to provide means whereby electrical currents, employed foroperating mechanical devices of the present invention may be amplified a-relatively hi h degree.

It is a still urther object of the invention that the control apparatus is adapted to be connected with any standard type of receivingapparatus for wireless telephony.

A still further object' of the invention is that means be provided whereby the over-f tones of the reproduced sounds may be eliminated. e

Other objects, and objects relating to details of construction, combination, and arrangement of parts will hereinafter appear in the detailed description to follow.

The invention is illustrated b way of example in the accompanying rawings, in wh1ch:-

Figure 1 is alongitudinal sectional view taken through the apparatus of the present invention and also showing diagrammatically the different mechanical devices for which the present invention may be employed for operating, V

Figure 2 is a diagrammatic viewillustratin the means of the present invention where y the feeble currents may be amplified.

Referring to the drawings specifically, and more particularly to Figure 1, 10 indicates,

eneral ly a casing which may be of any desired shape and the walls of which may be made of any suitable material. The casin as shown is cylindrical and its ends close by walls 1-111',-respectively. The interior of the casing and also one wall} 11 is covered with a lining 12 which is preferably of I elastic felt or some similar-absorbent material. Within the casinglm there is positioned. a diaphragm 13 w ich is preferably pivoted to the ca'slng at points diametrically opposite ,to each other, as shown at '14. This 'ent instance three tunin 1923. Serial No. 845,157.

diaphragm is adjacent the inner side of the end wall 11'. The end wall 11 is provided with an opening in which there is positioned a packing glan 15, said packing'gland havmg movable 'therethrough a link' 16, said -link having its end within the casing 10 engaging with the diaphragm 13 and its other end pivoted to a second link 17, as at With the construction heretofore set out,-

the currents received from a wireless receiving set will, of course, vibrate the diaphragm 19 which, will in turn transmit its vibrations through the links 16 and 17 to the large diaphragm 13 withinthe casing 10,'and the f interior of the casing will then become filled with a reproduction of sounds received by the wireless set or apparatus. The lining 12 for the casing is provided to further obviate the outside nolses, or sounds with respect to the interior ofthis casing and thus enable a more efiicient reproduction of sound waves from the diaphragm '13.

. As is well known to set a tuning fork in vibration by means of sound waves, the sound waves must have exactly the same pitch as the pitch of the fork. However,

these sound waves need notbe generated by another tuning fork.- The waves may come from a piano string, the human voice, a pipe organ or any other source. If a piano string is used it has been found that the sound.

Waves fromthispiano string will set several forks of different pitches into vibration. On the other'hand if the source of sound I provide a plurality of tuning forks which' are disposed within the casing. In the pres- 7 forks are shown, namely, 22, 23 and 24. I hese tuning forks ,is, an open diapason organ pipe only one may be of any desired construction and preferably supported in the manner shown..

As seen in Figure 1 the tuning forks 22, 23 and 24 are of different relative sizes and these tuning forks are so constructed that each will respond to a certain sound pitch. Each tuning fork carries on one of its prongs a microphone 25, said microphonebeing of any desired construction and being sup- 'ported by a'suitable standard or the like, as

E. M. F.

As before described the diaphragm 13' maybe vibrated to reproduce sounds received from a wireless receiving set and sound waves from this diaphragm will be set up in'the interior of the casing 10. If the sound waves were of a certain pitch and this pitch corresponded to the sound pitch at which the tuning fork 22. will operate this tuning fork will respond and set up a current flow of an alternating character in theelectric circuit including the transformer primary winding 30. This current set up.

will correspond to the sound pitch given off by the vibrations of the diaphragm 13'. The same will be true of the remaining tuning forks 23 and 24 thatis these tuning forks will operate to sound waves of a certain pitch and operate to set up a current of an-amplified character through the primary transformer coil 30 associated therewith. It becomes apparent from the de s'cription heretofore given that the present device might be utilized for causing different mechanical movements from a remote point with respect to the present apparatus, that is, a pipe organof the type heretofore'referred to, may be utilized for emitting sounds having pure tones and these sounds may" be transmitted by a suitable wireless transmitting apparatus so that they may be received and reproduced by the dlaphragm 13. The pipe organ may have ditferentkeys,

as is customary, and the proper keys may be operated to set into vibration either of the tuning forks 22, 23 and 24. In this way definite electric circuits may be established by wireless telephony at some remote point with relation to the transmitting apparatus.

In Figure 1 I have shown a secondary coil 32 for each of the primary transformer coils 30 and for the transformer associated with the tuning fork 22 there is provided an electro-magnet 33 which is connected through suitable wires 34 with the secondary pipe organ might be utilized for transmit-' ting sounds for operating the different keys of the typewriterf It is believed that this arrangement is entirely obvious from the description and illustration given and further illustration would, be unnecessary. With the secondary transformer coil associated with the tuning fork 23 there is connected an electro-magnet 35 through suitable wires 36. In this instance there is provided a switch lever 37 which is pivotally supported, as at 38, and which carries at its one end a pair of pins 39 which are electrically conne ted to each other. Forward to these pins there is disposed a'pair of sockets 40, each socket being connectedto a suitable wire 41. It may be assumed that upon the pins 39 being extended into the sockets 40 an electric circuit may be closed through the wires 41. The switch member 37 is normally held by a suitable spring 42', so that its pins 39 will not engage with the sockets 40. The switch lever 37 is adapted upon the electro-magnet 25 becoming energized to move under the influence of thismagnet and enter the sockets 40, and thus establish the electric circuit heretofore referred to. It is apparent that this electric circuit established may be utilized for giving a signal or set pressed air and which may have an outlet pipe .45. The piston head 46 is movable transversely of the outlet pipe and adapted to serve for closing or opening the same. This piston has connectedthereto a rod 47 which is slidable through a nipple 48 formed upon the pipe 45 and which carries-at its outer end an armature 50. As is energized the piston,46 will be moved out wardly and thus -to open the. pipe 45. Also a spring 51 may be provided whereby to normally hold the piston member 46', in its position for closing the pipe 45.

Referring to Figure 2, at 53 there is shown a transformer which may be similar to an obvious upon the electro-magnet 42 being audio-transformer such as used in connection with wireless telephony receiving sets receiver 57. The receiver 57 has connected thereto wires 58 whereby. the same may be connected with a wireless receiving apparahis in the customary manner. Also this receiver carries a second diaphragm 59 Whichis connected through suitable means, as at 60, to a microphone 61. This microphone is also connected through the wire 62 to one side of a battery or like source of electric current, as. at 63, and the other side of this. battery is connected through a wire 6i to the remaining end of the primary transformer coil 54. The secondary coil 64" of the transformer 53 may be connected to a volt meter or the like, as at 6,

In the use of the apparatus shown in Fig. 2, the currents. received from the wireless. receiving apparatus of course vibrate. the diaphragm 56 and this diaphragm in turn will vibrate the diaphragm 59 which in turn communicates these vibrations to the diaphragm of the microphone 61 and thus cause an amplified current to flow through the primary transformer coil 54 having the same.

alternations or fluctuations as that received by the receiver 57. The last-named current will be transmitted to the volt meter 66 through the means of the secondary transe former winding 64; and wires connecting said winding to the volt meter, and in this way the currentswill receive a higher voltage. 1 By observing the volt meter the fluctuations of the sound waves set in motion by I the diaphragm 46 may be observed. It is also apparent that instead of connecting the secondary transformer winding 64' to a volt meter it may be connected to another telephone receiver or the like and thereby repro du'ce the sound waves originally received at a louder tone. Also the second winding 'rangement of parts mayl wit be understood that I am aware of the fact that the construction, combination and arbe changed by those skilled in the art out departing from the spirit of the invention, as indicated by the appended claims. 1

I claim.:-

1. In an apparatus of the character described, a vibration and sound excluding container, a diaphragm within the container,

means for hingedly connecting the diaphragm to the walls of the container, means whereby the diaphragm may be set into vi-' bration for producing sound Waves of different pitch vaiues, a plurality of tuning forks within the container, each adapted to respond to sound waves of a different pitch, and means whereby different electrical circuits may be established with the vibration of said forks. 1 I 2. In an apparatus of the character de-' scribed a vibration and sound excluding container, a diaphragm within the container,

means wherebythe diaphragm may be vi--' brated without imparting vibration to the walls ofthe container, a plurality of tuning forks within the container 'adapted to respond to sound waves of difierent pitch, and means whereby. diiierentelectrical circuits may-be established with the vibration of said forks,

3. In an apparatus of the character described, 'a vibration and sound excluding enclosure, a diaphragm,- positioned therein, means for hingedly ponnecting the diaphragm to the Walls ofithe enclosure to support the diaphragm transversely of the enclosure, means operable from the exterior of the enclosure, whereby the diaphragm may be vibrated for producing sound waves of different pitch values, a plurality of tuning might be connectedtooperate an electromeans whereby different electrical circuits magnet for settm 1n motlon a mechanical may be established with the vibration of 7 device if so desire While I have shown and described the preferred form of my invention, I wish it to said tuning forks.

WILLIAM S. FERDON. 

